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purplesoupFlag for United Kingdom of Great Britain and Northern Ireland asked on

Regular Expression that supports foreign email address characters

The regular expression I use for email address validation is

\w+([-+!$%&*/=?{|}.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*

which I think is pretty standard but it doesn't support foreign characters such as

Ébaker@mydemo.com

Can anyone recommend a better expression?

Note I have come across this:
http://stackoverflow.com/questions/16454939/regex-to-validate-international-email

which seems to suggest using
[^\s@]+@[^\s@]+\.[^\s@]+

which appears more flexible but apparently does allow for example test@hello..com

Can someone tell me what the above expression is actually doing?

I know there is also this http://ex-parrot.com/~pdw/Mail-RFC822-Address.html which obviously seems like overkill (and interestingly doesn't seem to allow some of the foreign character examples the above expression does).

Also I'm using .net which may impact this as some of the "regex" testing sites seemed to think my original regex expression did actually allow my foreign example email address, but my ,net aspx page certainly doesn't allow it.
Regular ExpressionsASP.NETWeb Development

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purplesoup

8/22/2022 - Mon
Big Monty

If all you want to match is letters (including "international" letters) you can use \p{L}
ASKER
purplesoup

You mean this?

Doesn't seem to work - doesn't even validate standard email addresses

\p{L}+([-+!$%&*/=?{|}.']\p{L}+)*@\p{L}+([-.]\p{L}+)*\.\p{L}+([-.]\p{L}+)*
jitendra patil

try the below link, may be of use to you.
How To Validate An Email Address
hope this helps.
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William Peck
ASKER
purplesoup

He seems to be suggesting this

^(?!\.)("([^"\r\\]|\\["\r\\])*"|([-a-z0-9!#$%&'*+/=?^_`{|}~] |(?@[a-z0-9][\w\.-]*[a-z0-9]\.[a-z][a-z\.]*[a-z]$

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but all the regex online testing sites I've tried it on say it isn't valid...
jitendra patil

hi can you try some more from the below link
email address (RFC 2822 mailbox)
hope this helps.
ASKER
purplesoup

Hmm - not really sure what to make of these suggestions - you've posted a link to a whole page of email validator expressions, none of which work with foreign email addresses. That's about 21 expressions that don't work.

I'm testing it here:
http://www.freeformatter.com/regex-tester.html
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purplesoup

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ASKER
purplesoup

I found the answer from searching in the end - I couldn't get any of the suggested solutions to actually work.